In brief:
Yes

An ECG can typically make the diagnosis. If a gene was identified in your brother you should be tested to see if you have it as well.
Unfortunately, sometimes the first symptom can be very dangerous.

In brief:
Yes

If your brother has been formally diagnosed, you should be screened.

An ECG can typically make the diagnosis. If a gene was identified in your brother you should be tested to see if you have it as well.
Unfortunately, sometimes the first symptom can be very dangerous.
Would you like to video or text chat with me?

In brief:
Long qt

All 1st degree relatives should be checked, yes you need to be.

I assume he had genetic testing. If he is having fainting despite med, he might need an ICD. I am an expert in the field,
You can consult me or one of us if you need more detailed info.
www.healthtap.com/volkantuzcu

In brief:
Long qt

All 1st degree relatives should be checked, yes you need to be.

I assume he had genetic testing. If he is having fainting despite med, he might need an ICD. I am an expert in the field,
You can consult me or one of us if you need more detailed info.
www.healthtap.com/volkantuzcu
Would you like to video or text chat with me?